Grumman Aluminum Boats Is It Worth Buying A New Engine For An Old Boat?

Is it worth buying a new engine for an old boat? - grumman aluminum boats

My father has an aluminum boat from the 1960s Grumman. 16 feet. There is still a high gloss on a grindstone. But it is good to put a new engine in it? Or only have a chance?
He also was noted for 25 horses. Can they, for example, between 30 and 40 horsepower motor on it? It has a steering wheel and engine control lever. The helmet is heavy, aluminum thickness, the ice is solid.